501040020 has 48 divisors (see below), whose sum is σ = 1510830720. Its totient is φ = 123332736.

The previous prime is 501039991. The next prime is 501040021. The reversal of 501040020 is 20040105.

It is a super-2 number, since 2×501040020² = 502082203283200800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a junction number, because it is equal to n+sod(n) for n = 501039978 and 501040005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (501040021) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 320400 + ... + 321959.

It is an arithmetic number, because the mean of its divisors is an integer number (31475640).

Almost surely, 2^501040020 is an apocalyptic number.

It is an amenable number.

501040020 is an abundant number, since it is smaller than the sum of its proper divisors (1009790700).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

501040020 is a wasteful number, since it uses less digits than its factorization.

501040020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 642384 (or 642382 counting only the distinct ones).

The product of its (nonzero) digits is 40, while the sum is 12.

The square root of 501040020 is about 22383.9232486175. The cubic root of 501040020 is about 794.2504544831.

Adding to 501040020 its reverse (20040105), we get a palindrome (521080125).

The spelling of 501040020 in words is "five hundred one million, forty thousand, twenty".